<template>
  <div class="wrapper">
    <!-- header部分 -->
    <header>
      <p>商家信息</p>
    </header>
    <!-- 商家logo部分 -->
    <div class="business-logo">
      <img :src="business.businessImg">
    </div>
    <!-- 商家信息部分 -->
    <div class="business-info">
      <h1>{{business.businessName}}</h1>
      <p>&#165;{{business.starPrice}}起送 &#165;{{business.deliveryPrice}}配送</p>
      <p>{{business.businessExplain}}</p>
    </div>
    <!-- 食品列表部分 -->
    <ul class="food">
      <li v-for="(item, index) in foodArr" :key="item.foodId">
        <div class="food-left">
          <img :src="item.foodImg">
          <div class="food-left-info">
            <h3>{{item.foodName}}</h3>
            <p>{{item.foodExplain}}</p>
            <p>&#165;{{item.foodPrice}}</p>
          </div>
        </div>
        <div class="food-right">
          <div>
            <i class="fa fa-minus-circle" @click="minus(index)" v-show="item.quantity > 0"></i>
          </div>
          <p><span v-show="item.quantity > 0">{{item.quantity}}</span></p>
          <div>
            <i class="fa fa-plus-circle" @click="add(index)"></i>
          </div>
        </div>
      </li>
    </ul>
    <!-- 购物车部分 -->
    <div class="cart">
      <div class="cart-left">
        <div class="cart-left-icon" :style="totalQuantity==0?'background-color:#505051;':'background-color:#3190E8;'">
          <i class="fa fa-shopping-cart"></i>
          <div class="cart-left-icon-quantity" v-show="totalQuantity!=0">
            {{totalQuantity}}</div>
        </div>
        <div class="cart-left-info">
          <p>&#165;{{totalPrice}}</p>
          <p>另需配送费{{business.deliveryPrice}}元</p>
        </div>
      </div>
      <div class="cart-right">
        <!-- 不够起送费 -->
        <div class="cart-right-item" v-show="totalSettle<business.starPrice"
             style="background-color: #535356;cursor: default;">
          &#165;{{business.starPrice}}起送
        </div>
        <!-- 达到起送费 -->
        <div class="cart-right-item" @click="toOrder" v
             show="totalSettle>=business.starPrice">
          去结算
        </div>
      </div>
    </div>
  </div>
</template>

<script setup>
import { ref, computed, onMounted } from 'vue'
import { useRouter, useRoute } from 'vue-router'
import { businessApi } from '@/api/business'
import { cartApi } from '@/api/cart'
import { ElMessage } from 'element-plus'

const router = useRouter()
const route = useRoute()
const businessId = ref(route.query.businessId)
const business = ref({})
const foodArr = ref([])
const user = ref(null)

// 计算属性
const totalPrice = computed(() => {
  return foodArr.value.reduce((sum, item) => sum + item.foodPrice * item.quantity, 0)
})

const totalQuantity = computed(() => {
  return foodArr.value.reduce((sum, item) => sum + item.quantity, 0)
})

const totalSettle = computed(() => {
  return totalPrice.value + business.value.deliveryPrice
})

// 方法
const listCart = async () => {
  try {
    const response = await cartApi.listCart({
      userName: user.value.userName,
      businessId: business.value.businessId
    })
    if (response) {
      const cartArr = response
      foodArr.value.forEach(foodItem => {
        foodItem.quantity = 0
        cartArr.forEach(cartItem => {
          if (cartItem.foodId === foodItem.foodId) {
            foodItem.quantity = cartItem.quantity
          }
        })
      })
      foodArr.value.sort((a, b) => a.foodName.localeCompare(b.foodName))
    }
  } catch (error) {
    console.error('获取购物车失败:', error)
  }
}

const add = async (index) => {
  if (!user.value) {
    router.push('/login')
    return
  }

  const food = foodArr.value[index]
  try {
    if (food.quantity === 0) {
      // 新增购物车项
      await cartApi.saveCart({
        userName: user.value.userName,
        businessId: business.value.businessId,
        foodId: food.foodId,
        quantity: 1
      })
    } else {
      // 更新购物车项
      await cartApi.updateCart({
        userName: user.value.userName,
        businessId: business.value.businessId,
        foodId: food.foodId,
        quantity: food.quantity + 1
      })
    }
    await listCart()
  } catch (error) {
    console.error('添加商品失败:', error)
    ElMessage.error('添加商品失败，请稍后重试')
  }
}

// 从购物车减少商品
const minus = async (index) => {
  if (!user.value) {
    router.push('/login')
    return
  }

  const food = foodArr.value[index]
  try {
    if (food.quantity === 1) {
      // 删除购物车项
      await cartApi.removeCart({
        userName: user.value.userName,
        businessId: business.value.businessId,
        foodId: food.foodId
      })
    } else {
      // 更新购物车项
      await cartApi.updateCart({
        userName: user.value.userName,
        businessId: business.value.businessId,
        foodId: food.foodId,
        quantity: food.quantity - 1
      })
    }
    await listCart()
  } catch (error) {
    console.error('减少商品失败:', error)
    ElMessage.error('减少商品失败，请稍后重试')
  }
}

// 获取商家信息和食品列表
const initData = async () => {
  try {
    // 获取用户信息
    user.value = JSON.parse(sessionStorage.getItem('user'))
    
    const businessId = route.query.businessId
    // 获取商家信息
    const businessResponse = await businessApi.getBusinessById(businessId)
    business.value = businessResponse

    // 获取食品列表
    const foodResponse = await businessApi.listFoodByBusinessId(businessId)
    // 为每个食品项添加数量属性
    foodArr.value = foodResponse.map(item => ({
      ...item,
      quantity: 0
    }))

    // 如果用户已登录，获取购物车信息
    if (user.value) {
      await listCart()
    }
  } catch (error) {
    console.error('获取数据失败:', error)
    ElMessage.error('获取数据失败，请稍后重试')
  }
}

// 去结算方法
const toOrder = () => {
  if (!user.value) {
    ElMessage.warning('请先登录')
    router.push('/login')
    return
  }

  // 检查是否达到起送价
  if (totalSettle.value < business.value.starPrice) {
    ElMessage.warning(`还差${(business.value.starPrice - totalSettle.value).toFixed(2)}元起送`)
    return
  }

  // 检查是否有选择商品
  if (totalQuantity.value === 0) {
    ElMessage.warning('请选择商品')
    return
  }

  // 跳转到订单确认页面，并传递必要的参数
  router.push({
    path: '/order',
    query: {
      businessId: business.value.businessId,
      businessName: business.value.businessName,
      deliveryPrice: business.value.deliveryPrice
    }
  })
}

onMounted(() => {
  initData()
})
</script>

<style scoped>
/****************** 总容器 ******************/
.wrapper {
  width: 100%;
  height: 100%;
}

/****************** header部分 ******************/
.wrapper header {
  width: 100%;
  height: 12vw;
  background-color: #0097FF;
  color: #fff;
  font-size: 4.8vw;
  position: fixed;
  left: 0;
  top: 0;
  z-index: 1000;
  display: flex;
  justify-content: center;
  align-items: center;
}

/****************** 商家logo部分 ******************/
.wrapper .business-logo {
  width: 100%;
  height: 35vw;
  /*使用上外边距避开header部分*/
  margin-top: 12vw;
  display: flex;
  justify-content: center;
  align-items: center;
}

.wrapper .business-logo img {
  width: 40vw;
  height: 30vw;
  border-radius: 5px;
}

/****************** 商家信息部分 ******************/
.wrapper .business-info {
  width: 100%;
  height: 20vw;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.wrapper .business-info h1 {
  font-size: 5vw;
}

.wrapper .business-info p {
  font-size: 3vw;
  color: #666;
  margin-top: 1vw;
}

/****************** 食品列表部分 ******************/
.wrapper .food {
  width: 100%;
  /*使用下外边距避开footer部分*/
  margin-bottom: 14vw;
}

.wrapper .food li {
  width: 100%;
  box-sizing: border-box;
  padding: 2.5vw;
  user-select: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.wrapper .food li .food-left {
  display: flex;
  align-items: center;
}

.wrapper .food li .food-left img {
  width: 20vw;
  height: 20vw;
}

.wrapper .food li .food-left .food-left-info {
  margin-left: 3vw;
}

.wrapper .food li .food-left .food-left-info h3 {
  font-size: 3.8vw;
  color: #555;
}

.wrapper .food li .food-left .food-left-info p {
  font-size: 3vw;
  color: #888;
  margin-top: 2vw;
}

.wrapper .food li .food-right {
  width: 16vw;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.wrapper .food li .food-right .fa-minus-circle {
  font-size: 5.5vw;
  color: #999;
  cursor: pointer;
}

.wrapper .food li .food-right p {
  font-size: 3.6vw;
  color: #333;
}

.wrapper .food li .food-right .fa-plus-circle {
  font-size: 5.5vw;
  color: #0097EF;
  cursor: pointer;
}

/****************** 购物车部分 ******************/
.wrapper .cart {
  width: 100%;
  height: 14vw;
  position: fixed;
  left: 0;
  bottom: 0;
  display: flex;
}

.wrapper .cart .cart-left {
  flex: 2;
  background-color: #505051;
  display: flex;
}

.wrapper .cart .cart-left .cart-left-icon {
  width: 16vw;
  height: 16vw;
  box-sizing: border-box;
  border: solid 1.6vw #444;
  border-radius: 8vw;
  background-color: #3190E8;
  font-size: 7vw;
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: -4vw;
  margin-left: 3vw;
  position: relative;
}

.wrapper .cart .cart-left .cart-left-icon-quantity {
  width: 5vw;
  height: 5vw;
  border-radius: 2.5vw;
  background-color: red;
  color: #fff;
  font-size: 3.6vw;
  display: flex;
  justify-content: center;
  align-items: center;
  position: absolute;
  right: -1.5vw;
  top: -1.5vw;
}

.wrapper .cart .cart-left .cart-left-info p:first-child {
  font-size: 4.5vw;
  color: #fff;
  margin-top: 1vw;
}

.wrapper .cart .cart-left .cart-left-info p:last-child {
  font-size: 2.8vw;
  color: #AAA;
}

.wrapper .cart .cart-right {
  flex: 1;
}

/*达到送费时的样式*/
.wrapper .cart .cart-right .cart-right-item {
  width: 100%;
  height: 100%;
  background-color: #38CA73;
  color: #fff;
  font-size: 4.5vw;
  font-weight: 700;
  user-select: none;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
}

/*不够起送费时的样式（只有背景色和鼠标样式的区别）*/
/*
.wrapper .cart .cart-right .cart-right-item{
width: 100%;
height: 100%;
background-color: #535356;
color: #fff;
font-size: 4.5vw;
font-weight: 700;
user-select: none;
display: flex;
justify-content: center;
align-items: center;
}
*/
</style>
